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QR Codes have been around since the mid-90s, and have been common in Japan for quite some time where most of their local-customised phones have had the capabilities to read these codes.
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Google's URL shortener goo.gl will generate a QR code if you append .qr to any URL. The only bummer thing about this is that you can't just go to goo.gl and create a shortened URL. Apparently ...
Pablo Arrieta introduces his new book Leyendo Hipertextos: Una aventura desde los papiros hasta los pixeles, which has Augmented Reality tags for chapter headings, hidden chapters accessible via Q...